Structural and electronic properties of ultrathin picene films on the Ag(100) surface
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Pittsburgh, PA (United States); National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
- Univ. of Pittsburgh, PA (United States)
In this study we investigate using scanning tunneling microscopy and electronic structure calculations the growth, assembly, and electronic properties of picene molecules on the Ag(100), Ag(111), and Cu(111) surfaces, with particular emphasis on Ag(100). In each case, the picene molecules are found to lie parallel to the surface at coverages up to half a monolayer and to adopt alternating parallel and tilted orientations at full monolayer coverage. In the latter case, the arrangement of the molecules is roughly similar to that in the bulk crystal, making ultrathin films of picene interesting model systems and worthwhile to explore its electronic properties. On the 2 metal surfaces considered, the growth mode of picene is quite different from that of its structural isomer pentacene, which forms bilayer coverage on top of a dense monolayer of flat-lying molecules on metal surfaces. Tunneling spectroscopy measurements provide estimates of the energies of several low-lying molecular orbitals as well as of the highest unoccupied molecular orbital of the absorbed picene molecules. From analysis of these results, we establish that the on-site Coulomb repulsion for picene decreases by ~ 2 eV in going from the gas phase to the full monolayer on Ag(100), bringing it close to that of the undoped bulk crystal.
- Research Organization:
- National Energy Technology Lab. (NETL), Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- CHE-1362334
- OSTI ID:
- 1477238
- Alternate ID(s):
- OSTI ID: 1434789
- Journal Information:
- Surface Science, Vol. 652, Issue C; ISSN 0039-6028
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Well-ordered monolayers of alkali-doped coronene and picene: Molecular arrangements and electronic structures
Molecular adsorption and multilayer growth of pentacene on Cu(100): Layer structure and energetics